Not diesel clatter, not injectors. Tried to video, see here:

https://youtu.be/2ZRzbiljr70

In addition to typical diesel sound, it sounds almost like something is hitting into something else, it's a faint knock like something hard tapping something soft. Mounts seem ok... kind of like what I recall the air cleaner knock to sound like on a 617.952 when the little rubber mounts are bad, except these aren't.

Thoughts? Can you make out the sound? Its more noticeable in the second half of the video. Thought it was a wheel bearing when I heard it on the highway. Not that...

Thanks!

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)